isopiestic line

15 LETTERS · STARTS WITH I

isopiestic line is a valid 15-letter word worth 18 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1S1O1P3I1E1S1T1I1C3L1I1N1E1

1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 3 + 0 + 1 + 1 + 1 + 1 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does isopiestic line mean?